WAEC Physics 2021 Objective — Question 16

Question 16 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.

16. The inductive reactance in a circuit of frequency 100 Hz is 1 Ω. Calculate the inductance of the inductor. [π=3.14]

• A. 2.00×10⁻³ H
• B. 1.59×10⁻³ HCorrect
• C. 1.09×10⁻³ H
• D. 6.28×10⁻³ H

Explanation

XL=2πfL → L=XL/(2πf)=1/(2×3.14×100)=1.59×10⁻³ H.

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